Asian sailor is without skill (6)
I believe the answer is:
tartar
'asian' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'sailor is without skill' is the wordplay.
'sailor' becomes 'tar' (tar can mean a sailor).
'is without' is an insertion indicator ('without' can be similar in meaning to 'outside').
'skill' becomes 'art' (both can mean a talent).
'tar' enclosing 'art' is 'TARTAR'.
Can you help me to learn more?
(Other definitions for tartar that I've seen before include "Cream of - - : baking ingredient" , "Crust on teeth or wine deposit" , "ancient Mongolian" , "A ferocious person" , "Deposit that forms on teeth" .)